Preparation of substituted N-phenyl-4-aryl-2-pyrimidinamines as mediator release inhibitors
作者:Rolf Paul、William A. Hallett、John W. Hanifin、Marvin F. Reich、Bernard D. Johnson、Robert H. Lenhard、John P. Dusza、Suresh S. Kerwar、Yang I Lin
DOI:10.1021/jm00071a002
日期:1993.9
The role of immunologically released mediators, such as histamine, leukotrienes, and platelet-activating factor, is well-established for asthma and other allergic disorders. Developing therapeutic agents which would block mediator release from mast cells and other relevant cell types would provide a rational approach to asthma therapy. Using human basophil as a screen, a series of 4-aryl-2-(phenylamino)pyrimidines was found which inhibited mediator release. These compounds were prepared by condensing acetyl heterocycles with dimethylformamide dimethyl acetal to form enaminones which are cyclized with aryl guanidines to give pyrimidines. After examining a large number of analogs, N-[3-(1H-imidazol-1-yl)phenyl]-4-(2-pyridinyl)-2-pyrimidinamine (1-27) was chosen for toxicological evaluation.
<i>N</i>-Iodosuccinimide-Promoted [3 + 2] Annulation Reaction of Aryldiazonium Salts with Guanidines To Construct Aminotetrazoles
作者:Yi-Lin Yang、Shen Li、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.orglett.1c03395
日期:2021.11.19
A N-iodosuccinimide (NIS)-promoted [3 + 2] annulation reaction of aryldiazonium salts with guanidines has been developed for the construction of previously elusive 2-aryl-5-amino-2H-tetrazoles. This transformation takes advantage of readily available starting materials, proceeds under metal-free, mild, and robust conditions, and holds broad functional group compatibility. The utility of this protocol
Cleavage of 2-(Arylamino)-4,6-dimethoxypyrimidines To Yield Arylguanidines
作者:Julian W. Shaw、David H. Grayson、Isabel Rozas
DOI:10.1002/ejoc.201402179
日期:2014.6
A novel method for the synthesis of aryl-substituted guanidines in good overall yields is presented; it consists of the acidic cleavage of 2-(arylamino)-4,6-dimethoxypyrimidines, which were prepared by coupling aryl bromides with 2-amino-4,6-dimethoxypyrimidine. This methodology introduces a new means of protection for the guanidine functionality.